<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>home</title>
<style>


</style>

</head>
<body>
home.html
<!--<img src="static/images/tiger.jpg" style="width:200px">-->

<div class="a">
    a
    <div class="a1">a1</div>
    <div class="a2">a2</div>
    <div class="a3">
        a3
        <div class="b">
            b
            <div class="b1">b1</div>
        </div>

    </div>
</div>

</body>
</html>